Intel ® Pentium ® Iii Processor 512K Power Requirements; Voltage Tolerance; Multiple Voltages; Detailed Power Distribution Model - Intel Pentium III Processor 512K Design Manual

® ®
LV Intel Pentium III Processor 512K Dual Processor Platform
Figure 18. Detailed Power Distribution Model
Power Supply
psu
The voltage regulator should be designed in conjunction with the recommended load model
referenced in Figure 19.
Figure 19. VRM 8.5 Board Power Distribution Model
VRM 8.5
5.3 LV Intel
This section describes the issues related to supplying power to the processor. For detailed electrical
specifications, please refer to the Low Voltage Intel
5.3.1

Voltage Tolerance

Refer to the Low Voltage Intel
specifications. Failure to meet these specifications on the low-end tolerance results in transistors
slowing down and not meeting timing specifications. Failure to meet the specifications on the
high-end tolerance can cause damage or reduce the life of the processor.
5.3.2

Multiple Voltages

The VRM 8.5 voltage regulator, which provides the Vcc
voltages from +1.05 V to +1.825 V. The VRM 8.5 voltage regulator can provide adequate power
for all speed versions of the LV Intel Pentium
Converter Design Guidelines document for available voltage details.
32
Voltage Regulator
L
CABLE*
R S1
CABLE*
ESR
INPUT
S2
ESL
INPUT
C
INPUT
L
CABLE*
R
CABLE*
+V (14)
SENSE
Lcon
V
Rcon
CORE
W
0.69nH
0.50m
Rdecoup1
12/4m
Ldecoup1
Cdecoup1
4*560
V
SS
-V (13)
SENSE
® ®
Pentium III Processor 512K Power Requirements
®
Pentium
L
VR
L
R BOARD
VR
ESR
BULK
ESL
BULK
C
BULK
L
BOARD
R
+Vsense
W
1
Lmb1 Lmb2
Rmb1 Rmb2
W W
25.4pH 30.3pH
0.06m 0.1m
W W
Rdecoup2
10/4m
3.1/4nH Ldecoup2 1.1/4nH
m
m
Cdecoup2 4*22 F
F
R
-Vsen rtn
W
1
®
Pentium
®
III Processor 512K Datasheet for voltage tolerance
CORE
processor 512K. Refer to the VRM 8.5 DC-DC
III
Board Model
Processor
Equivalent model
L
*
PACKAGE
R * R
BOARD PACKAGE
RHf
ESR
decouple
ESL LHf
decouple
C
decouple
L
*
PACKAGE
*
R R
BOARD PACKAGE
W
Rdecoup3
10/5m
Processor
Ldecoup3
1.1/5nH
m
Cdecoup3
5*22 F
®
III Processor 512K Datasheet.
supply to the processor, can supply
Design Guide
CHf